import re

from django_redis import get_redis_connection
from rest_framework import serializers
from .models import Address
from .models import User
from rest_framework_jwt.settings import api_settings
from celery_tasks.email.tasks import send_verify_email


class UserAddressSerializer(serializers.ModelSerializer):
    """
    用户地址序列化器
    """
    province = serializers.StringRelatedField(read_only=True)
    city = serializers.StringRelatedField(read_only=True)
    district = serializers.StringRelatedField(read_only=True)
    province_id = serializers.IntegerField(label='省ID', required=True)
    city_id = serializers.IntegerField(label='市ID', required=True)
    district_id = serializers.IntegerField(label='区ID', required=True)

    class Meta:
        model = Address
        exclude = ('user', 'is_deleted', 'create_time', 'update_time')

    def validate_mobile(self, value):
        """
        验证手机号
        """
        if not re.match(r'^1[3-9]\d{9}$', value):
            raise serializers.ValidationError('手机号格式错误')
        return value

    def create(self, validated_data):
        """
        保存
        """
        validated_data['user'] = self.context['request'].user
        return super().create(validated_data)


class AddressTitleSerializer(serializers.ModelSerializer):
    """
    地址标题
    """
    class Meta:
        model = Address
        fields = ('title',)





class EmailSerializer(serializers.ModelSerializer):


    class Meta:
        model = User
        fields = ['id','email']
        #email字段执行必传
        extra_kwargs = {
            'email': {
                'required': True
            }
        }

    def update(self, instance, validated_data):
        """
        更新邮箱
        :param instance: 表示本次更新的模型对象 user
        :param validated_data: 经过验证的输入数据
        :return: user
        """
        instance.email = validated_data['email']
        instance.save()
        #生成邮箱激活链接
        verify_url = instance.generate_verify_email_url()
        #在更新了邮件之后响应结果之前发送邮箱的验证邮件
        send_verify_email.delay(instance.email,verify_url)
        return instance



class UserDetailSerializer(serializers.ModelSerializer):
    """
    用户详细信息序列化器
    """
    class Meta:
        model = User
        fields = ('id', 'username', 'mobile', 'email', 'email_active')

class UserSerializer(serializers.ModelSerializer):
    """注册序列化器"""

    #补充模型类以外的字段
    password2 = serializers.CharField(label='确认密码', write_only=True)
    sms_code = serializers.CharField(label='短信验证码', write_only=True)
    allow = serializers.CharField(label='同意协议', write_only=True)
    token = serializers.CharField(label='登陆保持token', read_only=True)


    class Meta:
        model = User
        #输入字段 username ,password ,password2 ,allow , sms_code
        #输出字段 id , username , mobile
        fields = ['id','username','mobile','password','password2','allow','sms_code','token']
        # fields = ['id', 'username', 'mobile', 'password', 'password2', 'allow', 'sms_code']

        extra_kwargs = {
            'username': {
                'min_length': 5,
                'max_length': 20,
                'error_messages': {
                    'min_length': '仅允许5-20个字符的用户名',
                    'max_length': '仅允许5-20个字符的用户名',
                }
            },
            'password': {
                'write_only': True,
                'min_length': 8,
                'max_length': 20,
                'error_messages': {
                    'min_length': '仅允许8-20个字符的密码',
                    'max_length': '仅允许8-20个字符的密码',
                }
            }
        }

    #追加验证字段
    def validate_mobile(self, value):
        """
        验证手机号格式
        :param value:
        :return: value
        """
        if not re.match(r'^1[3-9]\d{9}$',value):
            raise serializers.ValidationError('手机号格式错误')

        return value

    def validate_allow(self, value):
        """
        检验用户是否同意协议
        :param value: allow
        :return: value
        """
        if value != 'true':
            raise serializers.ValidationError('请勾选用户协议')
        return value

    def validate(self, data):
        # 判断两次密码.
        if data['password'] != data['password2']:
            raise serializers.ValidationError('两次密码不一致')

        # 判断短信验证码
        redis_conn = get_redis_connection('verify_codes')
        mobile = data['mobile']
        real_sms_code = redis_conn.get('sms_%s' % mobile)
        if real_sms_code is None:
            raise serializers.ValidationError('无效的短信验证码')
        if data['sms_code'] != real_sms_code.decode():
            raise serializers.ValidationError('短信验证码错误')

        return data


    def create(self,validated_data):
        """
        重写新增数据的方法
        :param validated_data: 经过效验的字段
        :return: None
        """

        #移除不能存入的字段
        del validated_data['password2']
        del validated_data['allow']
        del validated_data['sms_code']

        #储存用户注册数据 解包(**validated_data)
        user = User.objects.create(**validated_data)
        #密码加密
        user.set_password(validated_data.get('password'))
        user.save()


        #在注册成功之后 响应之前设置token

        jwt_payload_handler = api_settings.JWT_PAYLOAD_HANDLER
        jwt_encode_handler = api_settings.JWT_ENCODE_HANDLER
        #使用注册后的user信息 生成载荷
        payload = jwt_payload_handler(user)
        token = jwt_encode_handler(payload)
        #给user对象增加一个token属性 用于响应token信息
        user.token = token
        #响应注册结果
        return user